How does pressure and temperature effect moisture in the atmosphere?

Question

I really cannot find any answer. I have found half answers but they do not fully answer my question. I need help!

Answer 1

Warm air can hold more moisture than cold air.So.if the temperature is increased,the capacity of the air to hold moisture also increases.So,if the temperature of the air increases,the moisture content may also increase(provided moisture is supplied to air by some means).Not only this,the rate of evaporation over a water surface will increase if the temperature becomes more thereby increasing the moisture content in the air immediately above the water surface.So more the temperature,more is the moisture content.

But ,in the case of pressure,it does not affect the moisture.But moisture affects the air pressure.Water vapour(moisture) is a gas and it contributes its own pressure to the air pressure.So, the air pressure is the sum of the pressure due to water vapour and that of the dry air.But moist air is lighter than than dry air.So air which contains more moisture will be more lighter.As the air pressure is the weight of the ovelying column of air over a place,the air mixed with water vapour will exert less pressure.So,if the air contains more moisture,its pressure will be proportionally less.

Answer 2

I'm not a meteorologist, so I don't know much about the atmosphere, but I am a physicist, so I can give you information about how pressure and temperature effect the moisture in a gas.  

If the gas is above a body of water then the gas will contain a certain amount of water.  The amount is controlled by something called the vapor pressure of water which is essentially a measure of how much water can be in the gas before the water vapor will condense from the gas phase and return to the liquid phase.  

The vapor pressure of water depends on both the pressure and the temperature.  As the temperature goes up, the vapor pressure increases, which means that hotter air can contain more water vapor.  If you increase the pressure of the air, some of the water vapor in the gas will condense and form a liquid.

Answer 3

The warmer the temps the more moisture that a parcel of air can contain.  High pressure usually means drier as a result of subsidence.  Low pressure corresponds to warmer temps.. generally